var liObj=document.querySelectorAll('li')
    liObj.forEach(function(item,i){
        item.onmousemove=function(evt){
            var e=evt||window.event
            var tipsObj=document.querySelector('.tips')
            tipsObj.style.display='block'
            tipsObj.style.left=e.clientX-45+'px'
            tipsObj.style.top=e.clientY+'px'
        }
        item.onmouseout=function(){
            var tipsObj=document.querySelector('.tips')
            tipsObj.style.display='none'
        }
    })

